1.计算(x+y)^3/(x+y) 2.(3x+2y)^3 /(3x+2y)^2 3.已知(2m^3n^a)^2 /(28m^bn^2)=3.已知(2m^3n^a)^2/(28m^bn^2)=1/7n^2.试求(2a^3b)^2 /(-3a^5b)的值
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